Valve-seat-facing apparatus



July 16, .1929. H. G. MILLE` VALVE SEAT FACING APPARATUS j /4 l@ i?. W Z .W a4 H w 3 4 //Zz 5 M/ 0J snmuumllu; l lar/L, .vlhllll/ w a 4 li a s A 4 E zw /Wu 3 l" /l im,

IENTOR BY M July 16, 1929. H. G. MILLER v VALVE SEAT FACING APPARATUS.

Filed April 25, 1927 2 Sheets-Sheet 2 Patented July 16, 19295.

arreter HARRY G. MILLER, or DENVER, coLoRAno.

VALVE-SEAT-FACING APPARATUS.

Application filed April a5, 1927. seriai No. '186322.

This invention relates to improvements in line 3--3 of Figure 6, which shows ajfurther valve seat facing apparatus.

The primary object of this invention is to provide means for facing, finishing and burnishing valve seats truly concentric to the axial line of their valve stems when the valves are in operation, whereby valves which are also groundtrue to the axes of their stems will seat with perfect accuracy.

Heretofore it has been customary to provide a cutter or grinder with a rotatable stem to be received in the stem guide for the purpose of support-ing the cutter or valve seat grinder while the same is rotated for a cutting or grinding operation. Thie `supporting stems did not and could not be made to fit tightly in the guide-s and even in cases where a reasonably accurate fit was obtained, more or less vibration and deflection of the tool was permitted. If the tool was manually rotated, the pressure of the hand of the operator tended to crowd it laterally and thus produce an eccentric seating surface. `Where the tool was equipped with a power drive it was also difficult to avoid lateral thrust. If the guides were worn, and particularly if worn eccentrically, it was imposible to cut 'or grind the valve seats wit-li even approximate accuracy. Therefore, it is my object to provide the tool with a rigid support adapted to be iixedly an,-

chored in the guide preparatory to rotationl of the tool, the anchoring means being of such character as to position the support wit-li its axis coinciding with the line occu# pied by the axis of the Valve stem when the valve is in position for use.

A further object of thisinvention is to provide means for expeditiously rough cutting or trimming valveseats to provide seat-v ing surfaces of predetermined width and then giving to such seating surfaces an accuiate finishing cut or machining operation as above specified. A further object is to provide improved means for actuating the grinding tool and feeding it into the work during the machining operation.

In the drawings: Figure 1 is an elevation, partially invertical section, of valve seat facing apparatus embodying my invention as it appears in position for use, the valve seat and stem guide beingT also shown in vertical section.

Figure 2 is a similiar view, showing a modified form of construction.

Figure 3 is a sec-tional view drawn onv modification.

Figure is a sectional View drawn on line 1*1 of Figure. y y Figure 5 is a fragmentary sectional view transit -y showing means for adapting the apparatus for use in connection with facing tools of ordinary types. Y Figure 6 is a vertical sectional view of my improved apparatus embodying a further modification.

Figure 7 is a detail plan view of the gear case holder shown in Figure 2.

Figure 8 is a detail fragmentary View of a modified means for anchoring the tool supporting post.

Like parts are identified by the saine reference characters throughout the several views. In Figure 1 l have shown a fragment of a cylinder block 10 provided with a valve seat 11 at the outlet (or inlet) of the manifold passage 12, theblock being provided with a valve stem guide 13. These parts may be of any ordinary construction and are referred to merely to facilitate an explanation of the relation of my improved apparatus thereto when in position for use. i'

In my improved apparatus, the tool is supported by a rigid tubular post 15 having a conically tapered portion 16 adapted to enter the upper end of the guide 13 until it be-V comes wedged therein. This portionv l16 is abruptly tapered and preferably has the form of a hyperbolic conoid in order that it may be fitted to the upper ends of valve stem guides of somewhat different diameters without materially varying the position of the post vertically. When fitting the post to a worn guide or to any guide that is larger than the normal or standard size, it is important that the expander 18 shouldnot be lowered bellow the lower end of the guide or at least that the spiit lower end of the post to be expanded in anchorage with the .guide should not be materially lowered by any downward movement .f

of the post permitted by the worn or enlarged upper end of the guide. The abrupt taper of the portion 16 and its hyperbolic-curve insure a seating of the post at the top lof the guide within a narrow rangeV of vertical ad# justment an d prevent the post from reaching a point where anchorage cannot be obtained at both ends ofthe guide. The lower end' portion of the post is split longitudinally by y a serie-s or set of kerfs 17, whereby it may be expanded into gripping relation to the guide 13 by a eonically tapered expander 18 which is drawn into its lower end by a rod 19. The rod 19 extends upwardly through the post 15 and is threaded at its upper end to receive an actuating nut 20. The nut 20 bears upon the upper end of the post and by rotating the nut in one direction, the tapered portion 16 of the post is forced into anchorage at 'the upper end of the guide 13 Y and the expander cone 18 drawn into the lower end of the post by means of the rod 19, thus expanding and anchoring the lower end of the tubular post. It will, of course, be understood that the material of which the post is composed has suliicient resilience or flexibility to allow it to be spread when provided with the slots or kerfs 17.

A tool rotating carrier is rotatably mounted on the post 15 and comprises a knurled actuator wheel or disc 21 provided with a. downwardly projecting threaded hub 21 and a reduced downwardly tapered extension 22 V.adapted to lit a corresponding central aperture in a facing tool-23. The particular facing tool illustrated in Figure 1 has blades 24, but other facing, grinding or burnishing tools may be substituted. `To facilitate a removal of the facing or burnishing tool, a nut 26 is threaded to thecarrier hub 21 and after removing the post 15 from its anchoragev in the guide 13, the nut 26 may be screwed downwardly into Contact with the tool 23 to loosen f nthe latter upon/the tapered portion 22 of the hub. The nut 26 is provided with sockets 27 whereby itmay be manipulated by a lever receivable in such sockets. Similar sockets 28 areprovided in the actuator wheel 21 whereby `this wheel may also be lever actuated if desired. It will be found desirable at times to use a lever when operating a roughing tool but when operating a finishing or burnishing tool the wheel 21 may be directly turned by hand and the tool fed into i the work lightly to avoid any tendency to lat eral displacement under pressure of the rotating means.

The tool may be fed into the work by a feed nut 30, threaded to a sleeve 31, which may be anchored to the post 15 by any suitable means, preferably by the split collar 32 and a clamping screw 33 which may be operated by the lever 34 to clamp the sleeve 31 to the post or 1 fto release it therefrom. e

Ain Figure 1.

In Figure 2 a modified structure is illustrated and the same reference numerals are applied to corresponding modified parts with the letter a added. The post 15L is like that disclosed in Figure 1, but in Figure 2 the tool carrier may be regarded as comprising merely theportions 21la and 22a corresponding with the'hub portions 21 and 22 Portion 21a is provided with notches 40 adapted to receive rectangular clutch jaw teeth 41 carried by a driving gear wheel 42, which is mounted in a casing member 43 and actuated by a pinion 44. The pinposts corresponding with the post 54. If no post is found, the cylinder block may be tapped to receive one, or any other suitable means may be provided for holding the arm 53 and thereby prevent rotation of the gear casing. The feed nut 30 is constructed, supported and operated in the same manner as heretofore ldescribed with reference to the like parts shown in Figure 1. Y n

The use of a tubular post having its lower end split and adapted to be anchored by an expander cone operated from the upper end of the post by the nut 2O permits anchorage of the post without removing the valve seating spring 56. the capmember 57 of which is secured to the valve stem when the valve is in position for use. Such springs and caps are usually employed for seating'` the valves of internal combustion engines and in some engine structures they are not easily removable. Therefore the anchoring means disclosed in Figures 1 and 2 are preferable to any anchoring means which would require a removal of the spring 56. y

Referring to Figure 5, it will be observed that an actuating lever 60 is seated upon an upwardly projecting hub 61 of a carrier member 65 having a tapered lower end 221 upon which a cutter head 67 may be received. lrllhe lever clutch ring 63 has a one way acting spring clutch 62, (Fig. 3), and operates between a flange 68 on the carrier and a retainn ing ring 69, secured to the reduced upper portion 61 of the carrier by a suitablekey 70. A feed nut 71 is employed which is screwed directly to the post 15b. This post may bel assumed to be of the same construction as that shown in Figure 1 with the exception that its upper end will be threaded if it is desired to screw the feed nut 71 thereon as shown in Figure 5.

An obj ect of the construction illustrated in Figure 5 is to provide means whereby either ordinary or special cut-'ter heads may be utif lized, or whereby ordinary cutter'l grinder or burnishing may be removed and replaced rfrequently. The cutter head 67 is a special cutter for trimming valve seats to a standard width. Cutters having such blades may be used in all embodiments of my invention.

In the structure shown in Figures 3, 4 and 6, a cutter head 75 is provided with a hub7 5 having an extension 76, all formed integrally. A retaining ring 69 is anchored to the hub extension 76' by means of a key 7 O, which,

y when removed and the feed nut 7l unscrewed from the post 15C, permits a replacement of the cutter head 7 5. Thepost is constructed as shown in Figure 5 and-in all of the views except Figure 8 it will be assumed that the expander is constructed and' operated as shown in Figure l. In Figure 6, no separate tool carrier is used, the cutter head being mounted directly on the'post, and the feed nut being also mounted upon the threaded upper end portion of the post.

In Figure 8, I have illustrated a substitute means for anchoring the lower end of the post, which comprises a nut 8O threaded upon the lower end of the post 15d and provided with an upwardly tapered hub 31 to be forced into t-he guide 13 by the nut 80. In this construct-ion it would be necessary to remove the spring 56 shown in Figure 2.

It will be observed in Figures l, 2 and 6 that the nut 2() is of less diameter than the posty l5. Thereforethe feed nut, sleeve 3l and the tool carrier with associated parts, including the tool 23 may be removed without removing the post whenever it is desired to replace or substitute tools. This is a great advantage, particularly when the sleeve clamp 32 is used, inasmuch as tools may be quickly substituted without changing the position of the post after it has once been anchored.

I claim:

l. Valve seat facing apparatus V4comprising a supporting post provided with" anchoring means, and' a valve seat facing tool rotatively mounted on the post in combination with a sleeve provided with clamping means to ixedly engage the post and a feed nut threaded upon said sleeve and adapted to apply pressure to the tool to feed it into the work, said feed nut and tool being freely removable from the post when said clamp is released.

2. Valve seat facing apparatus comprising 'a supporting post having a lower end por tion provided with centering and anchoring y means for engagement in a valve stem guide, a valve seat facing tool rotatively-mounted on said post above the centering and anchoring means, a sleeve adapted to lit the post above said tool, means for adjustably securing the sleeve to the post, and a feed nut threaded to the sleeve and adapted to bear upon the tool to feed the same into contact with a valve seat. v y

3. Valve seat facing apparatus comprising a supporting post having a lower end portion provided with centering and anchoring means for engagement in a valve stem guide, a tool` supporting sleeve rotatably mounted on the post and having a tapered tool receiving lower end, a valve seat facing tool mounted on said sleeve above the centering and anchoring means, a tool releasing nut threaded to the sleeve above its tapered tool receiving end portion, a feed nut sleeveiadapted to tit-the post above said toolrsupporting sleeve, meansy for adj ustably securing. the sleeve `to the post, I a feednut threaded to tlesleeve and adapted to bear up'onthe tool! to` feed the sameinto contact with the'va-lve seat',` and means for rotatively actuating the tool.

4l. Valve seat; facing apparatus comprising a-tubular post yexpansible at its lower end and having an intermediate tapering portion ,;a1 valve seat facing tool rotatively mounted on the post above the taperingportion, a'.` sleevedetachably connected with the post above the tool, a feed nut carried by the sleeve and adapted for downward pressure upon the tool, an expander at the lower .end of the post adapted to anchor the post in a valve stem guide, an expander operating connection extending through the post, and an actuating nut threaded to the upper end of said connection and bearing upon the post, said nut being of less diameter than the interior diameter of said sleeve, whereby the sleeve may be re- A moved to permit a removal of the feed nut and tool without releasing the post.

5. Valve seat facing apparatus comprising a tubular post expansible at its lower end and having an intermediate tapering portion, a

tending through the post, and an actuating nut threaded to the upper end of said-connection and bearing upon the post, said nut being of less diameter than the interior diameter of said sleeve, whereby the feed nut carrying sleeve may be released and removed from the post to permit a removal and interchange of different facing cutters without releasing the post. v

6. Valve seat facing apparatus comprising. a tubular post expansible at its llower end and having an intermediate tapering abrupt hyperbolic conoidal portion, a valve seat facing tool rotativelymounted on the post above the taperingportion, a tool carrier removably l mounted `on the post, a sleeve removably clamping to the post above thetool carrier, ay feed nut carried bye-,the sleeve-and adapted toY exert downward pressure upon the tool car` `rier and tool, and a tool releaser connectedv with the carrier. i

7. In a'valve seat facing apparatus, the combination'of a rigid tool post, means for centering and anchoring the same in a valve stem guide, a tool carrier rotatably mounted on the Vpost and freely removable from the upper end portion thereof, vsaid carrier having la taperedy lower end portion to inter.-v i

changeably receive tools, a tool releasing nut' threaded to the carrier in a position to force tools from said tapering portion, an actuating head on the carrier above said nut7 a feed nut carrier provided with clamping means for engaging the post above the tool carrier and a feed nut threaded to the feed nut carrier, said feed nut carrier and tool carrier being freely removable from the upper end of the post when the. feed nut carrier Clamp is released. A

8. In a valve seat facing apparatus, the combination of a rigid tool post adapted lto be lanchored in a valve stem guide, a fac-ing tooll provided With a split Clamping liead, a elamp-l ing screw connecting the divided portions of tbe head and provided with an operating arm to facilitate quick Clamping and releasing operation and a feed nut threaded to said. feed nut sleeve, said sleeve and tool being freely removable from the upper end of the post when said clamping screw is turned to releasing position.

HARRYy G. MILLER. 

